<template>
	<div class="sc-upload-multiple">
		<el-upload
			ref="uploader"
			list-type="picture-card"
			:auto-upload="autoUpload"
			:disabled="disabled"
			:action="action"
			:name="name"
			:data="data"
			:http-request="request"
			v-model:file-list="defaultFileList"
			:show-file-list="showFileList"
			:accept="accept"
			:multiple="multiple"
			:limit="limit"
			:before-upload="before"
			:on-success="success"
			:on-error="error"
			:on-preview="handlePreview"
			:on-exceed="handleExceed"
		>
			<slot>
				<el-icon><el-icon-plus /></el-icon>
			</slot>
			<template #tip>
				<div v-if="tip" class="el-upload__tip">{{ tip }}</div>
			</template>
			<template #file="{ file }">
				<div class="sc-upload-list-item">
					<el-image
						class="el-upload-list__item-thumbnail"
						:src="file.url"
						fit="cover"
						:preview-src-list="preview"
						:initial-index="preview.findIndex((n) => n == file.url)"
						hide-on-click-modal
						append-to-body
						:z-index="9999"
					>
						<template #placeholder>
							<div class="sc-upload-multiple-image-slot">Loading...</div>
						</template>
					</el-image>
					<div v-if="!disabled && file.status == 'success'" class="sc-upload__item-actions">
						<span class="del" @click="handleRemove(file)"
							><el-icon><el-icon-delete /></el-icon
						></span>
					</div>
					<div
						v-if="file.status == 'ready' || file.status == 'uploading'"
						class="sc-upload__item-progress"
					>
						<el-progress :percentage="file.percentage" :text-inside="true" :stroke-width="16" />
					</div>
				</div>
			</template>
		</el-upload>
		<span style="display: none !important"><el-input v-model="value"></el-input></span>
	</div>
</template>

<script>
	import config from '@/config/upload'
	import Sortable from 'sortablejs'

	export default {
		props: {
			modelValue: { type: [String, Array], default: '' },
			tip: { type: String, default: '' },
			action: { type: String, default: '' },
			apiObj: { type: Object, default: () => {} },
			name: { type: String, default: config.filename },
			data: { type: Object, default: () => {} },
			accept: { type: String, default: 'image/gif, image/jpeg, image/png' },
			maxSize: { type: Number, default: config.maxSizeFile },
			limit: { type: Number, default: 0 },
			autoUpload: { type: Boolean, default: true },
			showFileList: { type: Boolean, default: true },
			multiple: { type: Boolean, default: true },
			disabled: { type: Boolean, default: false },
			draggable: { type: Boolean, default: false },
			onSuccess: {
				type: Function,
				default: () => {
					return true
				}
			}
		},
		data() {
			return {
				value: '',
				defaultFileList: []
			}
		},
		watch: {
			modelValue(val) {
				if (Array.isArray(val)) {
					if (JSON.stringify(val) != JSON.stringify(this.formatArr(this.defaultFileList))) {
						this.defaultFileList = val
						this.value = val
					}
				} else {
					if (val != this.toStr(this.defaultFileList)) {
						this.defaultFileList = this.toArr(val)
						this.value = val
					}
				}
			},
			defaultFileList: {
				handler(val) {
					this.$emit(
						'update:modelValue',
						Array.isArray(this.modelValue) ? this.formatArr(val) : this.toStr(val)
					)
					this.value = this.toStr(val)
				},
				deep: true
			}
		},
		computed: {
			preview() {
				return this.defaultFileList.map((v) => v.url)
			}
		},
		mounted() {
			this.defaultFileList = Array.isArray(this.modelValue)
				? this.modelValue
				: this.toArr(this.modelValue)
			this.value = this.modelValue
			if (!this.disabled && this.draggable) {
				this.rowDrop()
			}
		},
		methods: {
			//默认值转换为数组
			toArr(str) {
				var _arr = []
				var arr = str.split(',')
				arr.forEach((item) => {
					if (item) {
						var urlArr = item.split('/')
						var fileName = urlArr[urlArr.length - 1]
						_arr.push({
							name: fileName,
							url: item
						})
					}
				})
				return _arr
			},
			//数组转换为原始值
			toStr(arr) {
				return arr.map((v) => v.url).join(',')
			},
			//格式化数组值
			formatArr(arr) {
				var _arr = []
				arr.forEach((item) => {
					if (item) {
						_arr.push({
							name: item.name,
							url: item.url
						})
					}
				})
				return _arr
			},
			//拖拽
			rowDrop() {
				const _this = this
				const itemBox = this.$refs.uploader.$el.querySelector('.el-upload-list')
				Sortable.create(itemBox, {
					handle: '.el-upload-list__item',
					animation: 200,
					ghostClass: 'ghost',
					onEnd({ newIndex, oldIndex }) {
						const tableData = _this.defaultFileList
						const currRow = tableData.splice(oldIndex, 1)[0]
						tableData.splice(newIndex, 0, currRow)
					}
				})
			},
			before(file) {
				if (!['image/jpeg', 'image/png', 'image/gif'].includes(file.type)) {
					this.$message.warning(`选择的文件类型 ${file.type} 非图像类文件`)
					return false
				}
				const maxSize = file.size / 1024 / 1024 < this.maxSize
				if (!maxSize) {
					this.$message.warning(`上传文件大小不能超过 ${this.maxSize}MB!`)
					return false
				}
			},
			success(res, file) {
				var os = this.onSuccess(res, file)
				if (os != undefined && os == false) {
					return false
				}
				var response = config.parseData(res)
				file.name = response.fileName
				file.url = response.src
			},
			error(err) {
				this.$notify.error({
					title: '上传文件未成功',
					message: err
				})
			},
			beforeRemove(uploadFile) {
				return this.$confirm(`是否移除 ${uploadFile.name} ?`, '提示', {
					type: 'warning'
				})
					.then(() => {
						return true
					})
					.catch(() => {
						return false
					})
			},
			handleRemove(file) {
				this.$refs.uploader.handleRemove(file)
				//this.defaultFileList.splice(this.defaultFileList.findIndex(item => item.uid===file.uid), 1)
			},
			handleExceed() {
				this.$message.warning(`当前设置最多上传 ${this.limit} 个文件，请移除后上传!`)
			},
			handlePreview(uploadFile) {
				window.open(uploadFile.url)
			},
			request(param) {
				var apiObj = config.apiObj
				if (this.apiObj) {
					apiObj = this.apiObj
				}
				const data = new FormData()
				data.append(param.filename, param.file)
				for (const key in param.data) {
					data.append(key, param.data[key])
				}
				apiObj
					.post(data, {
						onUploadProgress: (e) => {
							const complete = parseInt(((e.loaded / e.total) * 100) | 0, 10)
							param.onProgress({ percent: complete })
						}
					})
					.then((res) => {
						var response = config.parseData(res)
						if (response.code == config.successCode) {
							param.onSuccess(res)
						} else {
							param.onError(response.msg || '未知错误')
						}
					})
					.catch((err) => {
						param.onError(err)
					})
			}
		}
	}
</script>

<style scoped>
	.el-form-item.is-error .sc-upload-multiple:deep(.el-upload--picture-card) {
		border-color: var(--el-color-danger);
	}
	:deep(.el-upload-list__item) {
		transition: none;
		border-radius: 0;
	}
	.sc-upload-multiple:deep(.el-upload-list__item.el-list-leave-active) {
		position: static !important;
	}
	.sc-upload-multiple:deep(.el-upload--picture-card) {
		border-radius: 0;
	}
	.sc-upload-list-item {
		width: 100%;
		height: 100%;
		position: relative;
	}
	.sc-upload-multiple .el-image {
		display: block;
	}
	.sc-upload-multiple .el-image:deep(img) {
		-webkit-user-drag: none;
	}
	.sc-upload-multiple-image-slot {
		display: flex;
		justify-content: center;
		align-items: center;
		width: 100%;
		height: 100%;
		font-size: 12px;
	}
	.sc-upload-multiple .el-upload-list__item:hover .sc-upload__item-actions {
		display: block;
	}
	.sc-upload__item-actions {
		position: absolute;
		top: 0;
		right: 0;
		display: none;
	}
	.sc-upload__item-actions span {
		display: flex;
		justify-content: center;
		align-items: center;
		width: 25px;
		height: 25px;
		cursor: pointer;
		color: #fff;
	}
	.sc-upload__item-actions span i {
		font-size: 12px;
	}
	.sc-upload__item-actions .del {
		background: #f56c6c;
	}
	.sc-upload__item-progress {
		position: absolute;
		width: 100%;
		height: 100%;
		top: 0;
		left: 0;
		background-color: var(--el-overlay-color-lighter);
	}
</style>
